結晶片岩地帯における地すべりと粘土鉱物 (2)
徳島県・森遠, 善徳, 半平地すべり
1979 年 32 巻 2 号 p. 1-5
詳細
1979 年 32 巻 2 号 p. 1-5
Clay samples were collected in Tokushima prefecture at the three landslide areas, Morito landslide existing in pelitic schist of Kashidaira formation and Mikabu green rock, Zentoku and Handaira landslide in pelitic schist of Koboke formation. The experimental method was the same as that in the previous report. The results are as follows;
1) The graysh green clay from Morito landslide area was composed of chlorite and Montmorillonite, and illite was not contained. Illite was usually found out in Sambagawa zone landslide but the clay collected from Morito area did not contain the illite, because from the clay mineralogical point of view, Morito landslide can be considered Mikabu zone. Vermiculite was contained in the surface layer with humus.
2) There were vermiculite and illite in the surface soil of Zentoku landslide area, but kaolinite and montmorillonite were not found. Montmorillonite was contained in the fault clay, which was in border between green schist and silliceous schist.
3) Only illite existed in the clay from Handaira landslide. A weathered rock was composed of a large quantity of illite and a small quantity of 14 Å minerals.
